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Kuznetsov VN, Glazkova NI, Mikhaylov RV, Sharaf IM, Ryabchuk VK, Emeline AV, Serpone N. Separation and Recombination of Photocarriers from Color Centers and Optically Silent Trap States from 100 to 450 K: The Halide Double Photochromic Perovskite Cs 2AgBiBr 6. ACS APPLIED MATERIALS & INTERFACES 2021; 13:25513-25522. [PMID: 34008939 DOI: 10.1021/acsami.1c03721] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Compared to lead-based solar cells whose power conversion efficiency is 25.2%, the highest power conversion efficiency of a halide double Cs2AgBiBr6-based perovskite solar cell is less than 3%. It was therefore relevant to unravel the inherent reason(s) for such a low efficiency in the latter that may be related to trapping/detrapping of photocarriers. Accordingly, photocoloration and photobleaching phenomena occurring in the Cs2AgBiBr6 photochromic perovskite were examined from 100 to 450 K by diffuse reflectance spectroscopy (DRS). The separation and recombination of photogenerated charge carriers implicated both color centers and optically silent trap states within the bandgap. The processes were reversible subsequent to heating after illumination at 100 K but were mostly irreversible at 290 K. DRS spectral and kinetic measurements at T = 100-450 K were carried out after visible light illumination that further revealed the nature of the various charge carrier traps in Cs2AgBiBr6. Results confirmed the separation of photogenerated electrons and holes, with formation of the color centers identified as deep electron traps. Three different photoinduced color centers were responsible for the absorption bands observed at 1.78 (ab1), 1.39 (ab2), and 1.10 eV (ab3) at 100 K. Annealing of these electron-type color centers occurred in the temperature range of 100-450 K via recombination with holes in the valence band following their thermal release from the several hole traps. Application of a first-order kinetic model to the thermoprogrammed annealing (TPA) of the color centers' spectra yielded estimates of the activation energies of hole detrapping and lifetimes of trapped holes at room temperature. The irreversibility of photocoloration at 290 K was caused by the formation of new deep hole trap states.
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Affiliation(s)
- Vyacheslav N Kuznetsov
- Faculty of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
| | - Nadezhda I Glazkova
- Laboratory of Photoactive Nanocomposite Materials, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
| | - Ruslan V Mikhaylov
- Faculty of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
| | - Ibrahim M Sharaf
- Faculty of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
| | - Vladimir K Ryabchuk
- Faculty of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
| | - Alexei V Emeline
- Faculty of Physics, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
- Laboratory of Photoactive Nanocomposite Materials, St. Petersburg State University, Universitetskaya nab. 7/9, St. Petersburg 199034, Russian Federation
| | - Nick Serpone
- PhotoGreen Laboratory, Dipartimento di Chimica, Università di Pavia, via Taramelli 12, Pavia 27100, Italy
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Shtarev DS, Shtareva AV, Selivanov NI, Ryabchuk VK, Rudakova AV, Serpone N. Optical Properties of Various Strontium Bismuthates: Luminescence and UV‐induced Photocoloration. CHEMPHOTOCHEM 2020. [DOI: 10.1002/cptc.202000128] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Dmitry S. Shtarev
- Yu. A. Kosygin Institute of Tectonics and Geophysics Far Eastern branch of the Russian Academy of Sciences 65 Kim Yu Chen Street Khabarovsk 680063 Russian Federation
| | - Anna V. Shtareva
- Yu. A. Kosygin Institute of Tectonics and Geophysics Far Eastern branch of the Russian Academy of Sciences 65 Kim Yu Chen Street Khabarovsk 680063 Russian Federation
| | - Nikita I. Selivanov
- Laboratory “Photoactive Nanocomposite Materials” Saint-Petersburg State University Ul'yanovskaya 1 Petergof, Saint-Petersburg 198904 Russian Federation
| | - Vladimir K. Ryabchuk
- Department of Photonics Saint-Petersburg State University Ul'yanovskaya 1 Petergof, Saint-Petersburg 198904 Russian Federation
| | - Aida V. Rudakova
- Laboratory “Photoactive Nanocomposite Materials” Saint-Petersburg State University Ul'yanovskaya 1 Petergof, Saint-Petersburg 198904 Russian Federation
| | - Nick Serpone
- PhotoGreen Laboratory, Dipartimento di Chimica Università di Pavia via Taramelli 12 Pavia 27100 Italy
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Giamello E, Pacchioni G. Applied vs fundamental research in heterogeneous photocatalysis: problems and perspectives. An introduction to 'physical principles of photocatalysis'. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2020; 32:360301. [PMID: 32396884 DOI: 10.1088/1361-648x/ab926b] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
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